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Yeah. I tried check outs and it worked now. Thanks.

SVN import download problem I tried to download Orbiter beta test from SVN server but it asked me to enter username and password. I did not see any instructions on that topics. That's why I want to try Orbiter with terrain elevations. Thanks, Sword7

Hello folks, I am looking for astrophysical data books about stars and planets. Does anyone have any recommendations about books or others? That's why I need some temperature, period, radius, etc.. each spectral and subclass. I have a copy of Hipparcos and Tycho star catalogue files but they...

Hello folks, I am working on my small program to simulate orbital flight simulator. I implemented angular velocity controls by using keyboard to pitch, yaw, or roll spacecraft. When I pitched down to 90 degrees and then tried to rotate right, spacecraft rolls right instead (origin axes...

Thanks for links. I looked into some information. I found some interesting about ocean simulation, etc. However, I have another few questions. How to simulate scattering atmosphere at planet Mars? Atmosphere color is very different by comparing with earth atmosphere. How stars appear in...

Yeah. I think that student is right. If you are on earth without atmosphere at sea level, fire cannon and ball travels at 18,000 mph, it is in circular orbit. A hour and half later, a ball return to hit back of the cannon. If a ball travels above 250 miles at 17,500 mph, it is in circular...

Ok, I got it. How about airglow at nighttime? Updates: I now found airglow formula. Airglow - Wikipedia, the free encyclopedia I am now figuring how to implement both formulas for atmosphere effects like real world. Thanks, Sword7

Hello folks, I watched some time-lapse video from ISS. I was impressed by atmospheric effects like scattering at twilight time and glass-looking at night time. When sun is at horizon, it scatters as orange. However, I had not seen any effects on flight simulators. Does anyone have...

Hello folks, Since I have some astrodynamics books and one physics book, I was looking for ebook versions through Amazon.com but can't find any books in ebook format. Does anyone have any good listings of astrodynamics and physics ebook for Kindle, etc? I now have some good astrodynamics...

Hello folks, I noticed interesting posting on Slashdot website a few weeks ago. That is about water droplets orbiting knitting needle experiment at ISS (microgravity). I researched about comparison between magnetism and gravity and learned something. Magnetism is strong virtual force while...

Hello folks, I now have Lightwave 3D 10.1 and am learning how to use it right now. Does anyone have any recommendation about alternative CAD modeling tools? How about TurboCAD 2D/3D Deluxe or Pro? Rhino 3D? That's why I prefer any CAD/model tools with native measurement units. I can't...

Hello folks, Well, I researched for more non-spherical gravity through google but learned some interesting about gravity. I have more some questions for you. Some years ago, they launched setallite with gravimeter to measure Earth's gravity and learned results as non-spherical gravity. For...

Hello folks, Ok, I searched for that through google and found cartesian/spherical coordinates conversion forth and back. For example, Cartesian to spherical conversion rho = sqrt(x^2 + y^2 + z^2) theta = atan2(y, x) phi = atan2(z, sqrt(x^2 + y^2)) Spherical to cartesian conversion x =...

Ok, thanks for providing gravity.pdf and I looked into 'Orbiter/Doc/Technotes' directory and found it. I noticed that non-spherical gravity formula in that documentation uses degree coordinations (not XYZ coordinations for graphics display). How about XYZ-based formula or do I have convert...

Hello folks, Since I searched for some addons, I noticed that some Star Trek addons. I have a question for you. Is that possible to navigate to other star systems from our solar system in several lightyears away? Thanks, Sword7

Oh, I forget that and was now searching for that. I found AC3D website and I now remember that X-plane supports for modelling. I will add that to my consideration. Thanks. I thought only CAD applications use metric systems. I will check out. Thanks again. Metric units in CAD/3D modellers...

Ok, I now got GMAT software and reviewed them. I have another questions about coefficient data. I only saw a few planets have gravity data for accurate orbit paths. How about asteroid, Jupiter moons, etc? How to calculate coefficient data for orbit? I am very new to that since I only know...

Hello folks, Since I have trueSpace 7.6 and Blender 2.49 on my system, they do not use measurements like metric systems, inch/foot, etc. I would consider about TurboCAD or ViaCAD for accurate measurments. Does anyone have any experience with both CAD applications for spacecraft...

Hello folks, On other forum, I noticed that non-spherical moons around Jupiter affects spacecraft's orbit path. How do moons orbits around football-shaped dwarf planet Haumea? How about potato-shaped, odd-shaped, etc? Does anyone have any good sources about gravity calculations for...

Ok, thanks for some replies about game developement. Yes, right. I found out that some physics/math for game developement books are so basic physics. At APress publisher's web site, source codes for "Physics for Game Programmers" are available for downloads. I looked into them and noticed...